System information block transmission

ABSTRACT

Methods, systems, and devices for wireless communication are described. A network entity may identify a first frequency range of a system bandwidth that is used for transmission of synchronization information. The network may identify a second frequency range of the system bandwidth that is used for transmission of common control information. The second frequency range may be a function of the first frequency range. The first and second frequency ranges may be less than the system bandwidth. In some cases, the second frequency range and the first frequency range may be a same frequency range. The network entity may transmit the common control information on a frequency within the second frequency range of the system bandwidth.

CROSS REFERENCES

The present Application for Patent is a continuation of U.S. patentapplication Ser. No. 15/711,565 by Akkarakaran, et al., entitled “SystemInformation Block Transmission,” filed Sep. 21, 2017, which claims thebenefit of U.S. Provisional Patent Application No. 62/408,658 byAkkarakaran, et al., entitled “System Information Block Transmission,”filed Oct. 14, 2016; each of which are assigned to the assignee hereof,and expressly incorporated by reference herein.

BACKGROUND

The following relates generally to wireless communication, and morespecifically to system information block transmission.

Wireless communications systems are widely deployed to provide varioustypes of communication content such as voice, video, packet data,messaging, broadcast, and so on. These systems may be capable ofsupporting communication with multiple users by sharing the availablesystem resources (e.g., time, frequency, and power). Examples of suchmultiple-access systems include code division multiple access (CDMA)systems, time division multiple access (TDMA) systems, frequencydivision multiple access (FDMA) systems, and orthogonal frequencydivision multiple access (OFDMA) systems, (e.g., a Long Term Evolution(LTE) system). A wireless multiple-access communications system mayinclude a number of base stations, each simultaneously supportingcommunication for multiple communication devices, which may be otherwiseknown as user equipment (UE).

By way of example, a wireless multiple-access communication system mayinclude a number of base stations, each simultaneously supportingcommunication for multiple communication devices (e.g., UEs). A basestation may communicate with UEs on downlink channels (e.g., fortransmissions from a base station to a UE) and uplink channels (e.g.,for transmissions from a UE to a base station).

Certain wireless systems may use short synchronization symbols, whichmay result in increased complexity for the device searching for thewireless system. To reduce this complexity, the synchronization andpossibly broadcast signals (such as signals broadcast on a physicalbroadcast channel (PBCH) as used in some wireless systems) may be senton a coarse frequency raster, which may limit the number of rasterpoints to be searched. However, the system bandwidth may be allocatedover a finer raster to enable flexible spectrum allocation in multiplefrequency bands, geographical locations, and across both licensed andshared spectrum. This may imply an offset, also referred to as a rasteroffset, between the center of the bandwidth occupied by thesynchronization information (such as primary synchronization signal(PSS), secondary synchronization signal (SSS), PBCH signals, etc.) andthe system bandwidth over which the remaining data traffic, includingbroadcast system-information messages (such as system information blocks(SIBs)) may be transmitted. Non-zero raster offsets, together with aneed for wireless systems to support UEs with different bandwidthcapabilities, may support a need for improved procedures fortransmitting SIB messages

SUMMARY

The described techniques relate to improved methods, systems, devices,or apparatuses that support efficient system information block (SIB)transmission in a wireless communication system. Generally, thedescribed techniques provide for a user equipment (UE) accessing afrequency range used for common control information based on a frequencyrange used for transmission of synchronization information. Thefrequency range used for transmission of the synchronization informationmay generally be known a priori, e.g., preconfigured, such that a UEinitializing in a new location or within a new wireless communicationsystem may know which frequencies to search for the synchronizationinformation. The frequency range used for transmission of the commoncontrol information may be the same as and/or a function of thefrequency range used for the transmission of the synchronizationinformation. Thus, the UE may access the frequency range used for thecommon control information to identify or otherwise determine othersystem information, such as the system bandwidth, raster offset, etc.

A method of wireless communication is described. The method may includeidentifying a first frequency range of a system bandwidth used fortransmission of a synchronization information, identifying a secondfrequency range of the system bandwidth used for transmission of commoncontrol information, the second frequency range of the system bandwidthbeing a first function of the first frequency range of the systembandwidth, and the first frequency range and the second frequency rangeeach being less than the system bandwidth, and receiving the commoncontrol information within the identified second frequency range of thesystem bandwidth.

An apparatus for wireless communication is described. The apparatus mayinclude means for identifying a first frequency range of a systembandwidth used for transmission of a synchronization information, meansfor identifying a second frequency range of the system bandwidth usedfor transmission of common control information, the second frequencyrange of the system bandwidth being a first function of the firstfrequency range of the system bandwidth, and the first frequency rangeand the second frequency range each being less than the systembandwidth, and means for receiving the common control information withinthe identified second frequency range of the system bandwidth.

Another apparatus for wireless communication is described. The apparatusmay include a processor, memory in electronic communication with theprocessor, and instructions stored in the memory. The instructions maybe operable to cause the processor to identify a first frequency rangeof a system bandwidth used for transmission of a synchronizationinformation, identify a second frequency range of the system bandwidthused for transmission of common control information, the secondfrequency range of the system bandwidth being a first function of thefirst frequency range of the system bandwidth, and the first frequencyrange and the second frequency range each being less than the systembandwidth, and receive the common control information within theidentified second frequency range of the system bandwidth.

A non-transitory computer readable medium for wireless communication isdescribed. The non-transitory computer-readable medium may includeinstructions operable to cause a processor to identify a first frequencyrange of a system bandwidth used for transmission of a synchronizationinformation, identify a second frequency range of the system bandwidthused for transmission of common control information, the secondfrequency range of the system bandwidth being a first function of thefirst frequency range of the system bandwidth, and the first frequencyrange and the second frequency range each being less than the systembandwidth, and receive the common control information within theidentified second frequency range of the system bandwidth.

In some examples of the method, apparatus, and non-transitorycomputer-readable medium described above, the first frequency range andthe second frequency range may be a same frequency range.

Some examples of the method, apparatus, and non-transitorycomputer-readable medium described above may further include processes,features, means, or instructions for descrambling a reference signalused to decode the common control information according to a scramblingscheme, the scrambling scheme being a second function of the firstfrequency range of the system bandwidth.

In some examples of the method, apparatus, and non-transitorycomputer-readable medium described above, the scrambling schemecomprises use of a scrambling sequence to scramble the reference signalassociated with the second frequency range that may be different from asystem scrambling sequence to scramble other reference signalsassociated with frequencies outside of the second frequency range.

In some examples of the method, apparatus, and non-transitorycomputer-readable medium described above, the scrambling schemecomprises use of a mid-tone scrambling sequence that begins at a centerfrequency of the second frequency range and proceeds outward through thesystem bandwidth.

Some examples of the method, apparatus, and non-transitorycomputer-readable medium described above may further include processes,features, means, or instructions for identifying a third frequency rangeof the system bandwidth used for transmission of one or more messagesassociated with a random access channel (RACH) procedure, the thirdfrequency range being a third function of the first frequency range ofthe system bandwidth.

Some examples of the method, apparatus, and non-transitorycomputer-readable medium described above may further include processes,features, means, or instructions for transmitting a pre-RACHtransmission to a base station at a frequency within the third frequencyrange. Some examples of the method, apparatus, and non-transitorycomputer-readable medium described above may further include processes,features, means, or instructions for receiving, responsive to thepre-RACH transmission, the common control information from the basestation.

In some examples of the method, apparatus, and non-transitorycomputer-readable medium described above, the common control informationmay be received according to a beamforming direction that may beindicated by the pre-RACH transmission.

In some examples of the method, apparatus, and non-transitorycomputer-readable medium described above, the common control informationcomprises a downlink transmission, the downlink transmission comprisinga SIB transmitted on a physical downlink control channel (PDCCH) or adownlink grant for a physical downlink shared channel (PDSCH) carryingthe SIB.

In some examples of the method, apparatus, and non-transitorycomputer-readable medium described above, the common control informationcomprises a SIB, the SIB indicating the system bandwidth, a rasteroffset, or both.

Some examples of the method, apparatus, and non-transitorycomputer-readable medium described above may further include processes,features, means, or instructions for receiving the common controlinformation according to a cyclic shift pattern, wherein the cyclicshift pattern comprises one or more blocks of tones conveying the commoncontrol information.

In some examples of the method, apparatus, and non-transitorycomputer-readable medium described above, the synchronizationinformation comprises at least one of a primary synchronization signal(PSS), a secondary synchronization signal (SSS), a broadcast signal, aphysical broadcast channel (PBCH), or any combination thereof.

A method of wireless communication is described. The method may includeidentifying a first frequency range of a system bandwidth used fortransmission of synchronization information, selecting a secondfrequency range of the system bandwidth used for transmission of commoncontrol information, the second frequency range of the system bandwidthbeing a first function of the first frequency range of the systembandwidth, and the first frequency range and the second frequency rangeeach being less than the system bandwidth, and transmitting the commoncontrol information at a frequency within the selected second frequencyrange of the system bandwidth.

An apparatus for wireless communication is described. The apparatus mayinclude means for identifying a first frequency range of a systembandwidth used for transmission of synchronization information, meansfor selecting a second frequency range of the system bandwidth used fortransmission of common control information, the second frequency rangeof the system bandwidth being a first function of the first frequencyrange of the system bandwidth, and the first frequency range and thesecond frequency range each being less than the system bandwidth, andmeans for transmitting the common control information at a frequencywithin the selected second frequency range of the system bandwidth.

Another apparatus for wireless communication is described. The apparatusmay include a processor, memory in electronic communication with theprocessor, and instructions stored in the memory. The instructions maybe operable to cause the processor to identify a first frequency rangeof a system bandwidth used for transmission of synchronizationinformation, select a second frequency range of the system bandwidthused for transmission of common control information, the secondfrequency range of the system bandwidth being a first function of thefirst frequency range of the system bandwidth, and the first frequencyrange and the second frequency range each being less than the systembandwidth, and transmit the common control information at a frequencywithin the selected second frequency range of the system bandwidth.

A non-transitory computer readable medium for wireless communication isdescribed. The non-transitory computer-readable medium may includeinstructions operable to cause a processor to identify a first frequencyrange of a system bandwidth used for transmission of synchronizationinformation, select a second frequency range of the system bandwidthused for transmission of common control information, the secondfrequency range of the system bandwidth being a first function of thefirst frequency range of the system bandwidth, and the first frequencyrange and the second frequency range each being less than the systembandwidth, and transmit the common control information at a frequencywithin the selected second frequency range of the system bandwidth.

In some examples of the method, apparatus, and non-transitorycomputer-readable medium described above, the first frequency range andthe second frequency range may be a same frequency range.

Some examples of the method, apparatus, and non-transitorycomputer-readable medium described above may further include processes,features, means, or instructions for selecting a scrambling scheme for areference signal used to decode the common control information, thescrambling scheme being a second function of the first frequency rangeof the system bandwidth.

Some examples of the method, apparatus, and non-transitorycomputer-readable medium described above may further include processes,features, means, or instructions for selecting a third frequency rangeof the system bandwidth used for transmissions of one or more messagesassociated with a RACH procedure, the third frequency range being athird function of the first frequency range of the system bandwidth.

Some examples of the method, apparatus, and non-transitorycomputer-readable medium described above may further include processes,features, means, or instructions for receiving a pre-RACH transmissionfrom a UE at a frequency within the third frequency range. Some examplesof the method, apparatus, and non-transitory computer-readable mediumdescribed above may further include processes, features, means, orinstructions for transmitting, responsive to receiving the pre-RACHtransmission, the common control information to the UE.

In some examples of the method, apparatus, and non-transitorycomputer-readable medium described above, the common control informationmay be transmitted according to a beamforming direction that may beindicated by the pre-RACH transmission.

Some examples of the method, apparatus, and non-transitorycomputer-readable medium described above may further include processes,features, means, or instructions for selecting a cyclic shift patternfor one or more blocks of tones conveying the common controlinformation. Some examples of the method, apparatus, and non-transitorycomputer-readable medium described above may further include processes,features, means, or instructions for transmitting the common controlinformation according to the cyclic shift pattern.

Some examples of the method, apparatus, and non-transitorycomputer-readable medium described above may further include processes,features, means, or instructions for selecting a set of clusters for amulti-cluster discrete Fourier transform-spread-orthogonal frequencydivision multiplexing (DFT-s-OFDM) scheme, wherein each cluster in themulti-cluster DFT-s-OFDM scheme may be associated with a differentdiscrete Fourier transform (DFT) spreading function, wherein the set ofclusters identify the one or more blocks of tones. Some examples of themethod, apparatus, and non-transitory computer-readable medium describedabove may further include processes, features, means, or instructionsfor transmitting the common control information according to the set ofclusters.

In some examples of the method, apparatus, and non-transitorycomputer-readable medium described above, the common control informationcomprises a downlink transmission, the downlink transmission comprisinga SIB transmitted on a PDCCH or a downlink grant for a PDSCH carryingthe SIB.

Some examples of the method, apparatus, and non-transitorycomputer-readable medium described above may further include processes,features, means, or instructions for transmitting the SIB in the commoncontrol information using a fixed frequency allocation, a knownmodulation order, a known scrambling order, or a combination thereof.

Some examples of the method, apparatus, and non-transitorycomputer-readable medium described above may further include processes,features, means, or instructions for encoding the synchronizationinformation to convey information associated with a SIB, wherein theinformation may be a fourth function of the synchronization information.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 illustrates an example of a system for wireless communicationthat supports system information block transmission in accordance withaspects of the present disclosure;

FIG. 2 illustrates an example of a process flow that supports systeminformation block transmission in accordance with aspects of the presentdisclosure;

FIG. 3 illustrates an example of a bandwidth diagram that supportssystem information block transmission in accordance with aspects of thepresent disclosure;

FIG. 4 illustrates an example of a process flow that supports systeminformation block transmission in accordance with aspects of the presentdisclosure;

FIG. 5 illustrates an example of a bandwidth diagram that supportssystem information block transmission in accordance with aspects of thepresent disclosure;

FIGS. 6 through 8 show block diagrams of a device that supports systeminformation block transmission in accordance with aspects of the presentdisclosure;

FIG. 9 illustrates a block diagram of a system including a networkentity that supports system information block transmission in accordancewith aspects of the present disclosure;

FIGS. 10 through 12 show block diagrams of a device that supports systeminformation block transmission in accordance with aspects of the presentdisclosure;

FIG. 13 illustrates a block diagram of a system including a userequipment that supports system information block transmission inaccordance with aspects of the present disclosure; and

FIGS. 14 through 17 illustrate methods for system information blocktransmission in accordance with aspects of the present disclosure.

DETAILED DESCRIPTION

Certain wireless communication systems may be configured such that thechannelization used for all downlink and uplink channels, with theexception of channels (or frequencies) used for synchronizationinformation, is defined for a user equipment (UE) once the UE knows thesystem bandwidth and raster offset. The channelization may refer to thetone mapping in systems based on variants of orthogonal frequencydivision multiplexing (OFDM) techniques, based on scrambling sequences,based on a defined search space in which the UE knows to look to receivethe downlink control channel (such as common control information), etc.Such wireless communications systems may use base stations broadcastingon a channel (such as a physical broadcast channel (PBCH)) a portion ofthe system information, such as system bandwidth, raster offset, etc.The UE may determine the remaining portion of the system informationusing multiple-hypothesis blind decoding, for example. Such broadcastsignals, however, may be associated with increased overhead, for examplein systems that support beamformed transmissions (e.g., which may beused to compensate for signal attenuation in a millimeter wave (mmW)wireless communication system). Such systems may use narrow beams tobroadcast the signals which may require beam sweeping and/or increasedcoding redundancy to compensate for reduced penetration of the signals.Also, multiple hypothesis blind decoding for the UE may contribute toincreased UE complexity.

Aspects of the disclosure are initially described in the context of awireless communication system. A network entity and a UE may know afrequency range that is used for transmission of synchronizationinformation (e.g., a first frequency range). The network entity mayselect a frequency range to be used for transmission of common controlinformation (e.g., a second frequency range) based on the frequencyrange used for the transmission of the synchronization information. Forexample, the first frequency range may convey a location of a PBCH in atime-frequency grid, and the location of the PBCH may inform thelocation of the second frequency range. Thus, a UE performing an initialsearch and synchronization may know the second frequency range based onor as a function of the first frequency range.

FIG. 1 illustrates an example of a wireless communications system 100 inaccordance with various aspects of the present disclosure. The wirelesscommunications system 100 includes base stations 105, UEs 115, and acore network 130. In some examples, the wireless communications system100 may be a Long Term Evolution (LTE) or LTE-Advanced (LTE-A) network.

Base stations 105 may wirelessly communicate with UEs 115 via one ormore base station antennas. Each base station 105 may providecommunication coverage for a respective geographic coverage area 110.Communication links 125 shown in wireless communications system 100 mayinclude uplink transmissions from a UE 115 to a base station 105, ordownlink transmissions, from a base station 105 to a UE 115. UEs 115 maybe dispersed throughout the wireless communications system 100, and eachUE 115 may be stationary or mobile. A UE 115 may also be referred to asa mobile station, a subscriber station, a mobile unit, a subscriberunit, a wireless unit, a remote unit, a mobile device, a wirelessdevice, a wireless communications device, a remote device, a mobilesubscriber station, an access terminal, a mobile terminal, a wirelessterminal, a remote terminal, a handset, a user agent, a mobile client, aclient, or some other suitable terminology. A UE 115 may also be acellular phone, a personal digital assistant (PDA), a wireless modem, awireless communication device, a handheld device, a tablet computer, alaptop computer, a cordless phone, a personal electronic device, ahandheld device, a personal computer, a wireless local loop (WLL)station, an Internet of things (IoT) device, an Internet of Everything(IoE) device, a machine type communication (MTC) device, an appliance,an automobile, or the like.

Base stations 105 may communicate with the core network 130 and with oneanother. For example, base stations 105 may interface with the corenetwork 130 through backhaul links 132 (e.g., S1, etc.). Base stations105 may communicate with one another over backhaul links 134 (e.g., X2,etc.) either directly or indirectly (e.g., through core network 130).Base stations 105 may perform radio configuration and scheduling forcommunication with UEs 115, or may operate under the control of a basestation controller (not shown). In some examples, base stations 105 maybe macro cells, small cells, hot spots, or the like. Base stations 105may also be referred to as eNodeBs (eNBs) 105. Core network 130, or acomponent thereof, may be an example of a network entity configured tosupport aspects of the described techniques. Example components of acore network 130 may include, but are not limited to, a mobilitymanagement entity (MME), a home subscriber server (HSS), one or moregateways, and the like, which may be configured to support the describedtechniques.

In some cases, wireless communication system 100 may utilize differentportions of the radio frequency spectrum band. In some examples,wireless communication system 100 may utilize one or more of anunlicensed spectrum, a licensed spectrum, a lightly licensed spectrum,licensed assisted access (e.g., licensed plus unlicensed spectrum),sub-6 GHz spectrum, millimeter-wave (mmW) spectrum, etc.

In some aspects, a network entity (such as core network 130 (or acomponent of core network 130) and/or a base station 105) may beconfigured for SIB transmission in accordance with aspects of thepresent disclosure. For example, the network entity may identify a firstfrequency range of a system bandwidth that is used for transmission ofsynchronization information. The network entity may select a secondfrequency range of the system bandwidth that is used for transmission ofcommon control information. The second frequency range of the systembandwidth may be based on or a function of the first frequency range ofthe system bandwidth. The first and second frequency ranges may be lessthan the system bandwidth. The network entity may transmit the commoncontrol information at a frequency within the selected second frequencyrange of the system bandwidth.

A receiving device, such as a UE 115, may identify a first frequencyrange of a system bandwidth that is used for transmission ofsynchronization information. The UE 115 may identify a second frequencyrange of the system bandwidth that is used for transmission of a commoncontrol information. The second frequency range of the system bandwidthmay be based on or a function of the first frequency range of the systembandwidth. The first and second frequency ranges may be less than thesystem bandwidth. The UE 115 may receive the common control informationat a frequency within the identified second frequency range of thesystem bandwidth.

FIG. 2 illustrates an example of a process flow 200 for systeminformation block transmission. Process flow 200 may implement one ormore aspects of wireless communication system 100 of FIG. 1. Processflow 200 may include a UE 205 and a network entity 210, which may beexamples of the corresponding devices of FIG. 1.

Broadly, process flow 200 may implement an example process where thechannelization of the downlink grants and definition of the commonsearch space (e.g., second frequency range) is based on or a function ofthe bandwidth occupancy (e.g., first frequency range) of thesynchronization signals. The common search space may occupy the samefrequency range as the synchronization signals. For example, thefrequency range of the common search space could be a function of thebandwidth occupied by the synchronization signals and of any broadcastinformation already decoded (e.g., broadcast signals from a PBCH).Examples of the earlier decoded information may include, but is notlimited to, a frame or a subframe index.

At 215, the network entity 210 may identify the first frequency range ofa system bandwidth used for transmission of synchronization information.The first frequency range of the system bandwidth may be known orpreconfigured for the wireless communication system. The synchronizationinformation may include one or more of a primary synchronization signal(PSS), a secondary synchronization signal (SSS), a broadcast signal, aphysical broadcast channel (PBCH), and the like.

In some aspects, the synchronization information may be encoded toconvey an indication or information associated with the SIB, theinformation being a function of the synchronization information. Forexample, network entity 210 may avoid scheduling grants for SIBs bypre-configuring information in those grants to be a function ofbroadcast information that UE 205 has previously decoded, e.g., prior toreading the SIBs.

At 220, the network entity 210 may select the second frequency range ofthe system bandwidth that is used for the transmission of the commoncontrol information. The second frequency range may be selected based onthe first frequency range. For example, the second frequency range maybe the same frequency range as the first frequency range, may be offseta predetermined distance up or down from the first frequency range, mayinclude a subset or superset of frequencies selected based on the firstfrequency range, and the like.

In some aspects, the common control information may include a downlinkgrant that is transmitted on a physical downlink control channel(PDCCH). Alternatively, the downlink grant may be for a physicaldownlink shared channel (PDSCH) carrying the system information. Thedownlink grant may provide an indication of a resource used to convey aSIB. The SIB may contain additional information associated with thewireless communication system, such as the system bandwidth, the rasteroffset, and the like. Thus, network entity 210 may configure the commoncontrol information to convey an indication of the SIB grant.

In some aspects, the common control information may include the SIB thatindicates or otherwise includes information associated with the systembandwidth and the raster offset. In this example, the SIB may betransmitted according to a fixed frequency allocation, using a knownmodulation order, using a known scrambling sequence or order, or thelike. In some aspects, the SIB included in the common controlinformation may include all information traditionally conveyed in adownlink grant. In some aspects, the SIB included in the common controlinformation may be transmitted in a fixed set of subframes or slots. Invarious examples, a subframe or a slot may be used (in some casesinterchangeably) to illustrate a basic transmission time interval (TTI).In some aspects, the information included in the SIB of the commoncontrol information may be time-varying rather than fixed, provided thatthe time-variation may be a function of parameters already decoded fromthe synchronization information. This information may be preconfiguredsuch that UE 205 and network entity 210 know which frequency allocation,modulation order, etc., are associated with the SIB included in thecommon control information. In some aspects, the SIB included in thecommon control information may be broadcast.

At 225, the UE 205 may identify the first frequency range that is usedfor transmission of synchronization information. As discussed above, thefirst frequency range may be preconfigured and therefore UE 205 may knowthe first frequency range a priori.

At 230, the UE 205 may identify the second frequency range that is usedfor the transmission of common control information. As discussed above,the second frequency range may be based on the first frequency range,e.g., may be the same frequency range, may be a function of the firstfrequency range, and the like. Generally, UE 205 may have preconfiguredinformation associated with the relationship between the first frequencyrange and the second frequency range, e.g., information that may be usedto derive the second frequency range based at least in part on the firstfrequency range. UE 205 may use this preconfigured information toidentify the second frequency range.

At 235, the network entity 210 may transmit (and UE 205 may receive) thecommon control information, e.g., via a base station. As discussed, thecommon control information may include a downlink grant, may include aSIB that indicates the system bandwidth and raster offset, etc.

In some aspects, the common control information may include a downlinkgrant and use a scrambling scheme on a reference signal that is used todecode the common control information. For example, a scrambling schememay be a function of the first frequency range. The scrambling schememay be different from a system scrambling scheme (e.g., the scramblingscheme used to scramble other reference signals associated withfrequencies outside of the second frequency range). As the secondfrequency range is based on or a function of the first frequency range,the scrambling scheme may also be said to be associated with the firstfrequency range of the system bandwidth.

Broadly, the scrambling of the reference signals used to decode thedownlink grant (e.g., the downlink grant carried in the PDCCH thatidentifies the resource allocation for SIB) may be done beginning fromthe center of the second frequency range and then proceed out towardsthe edges of the system bandwidth. As another alternative approach, ascrambling scheme may be defined across the system bandwidth, with theexception that the portion of the system bandwidth within the secondfrequency range may use a different scrambling scheme. Each of theseapproaches may provide for descrambling common control informationwithout UE 205 knowing the system bandwidth or raster offset yet.

In some aspects, the scrambling scheme may use scrambling sequences toscramble the reference signals associated with the second frequencyrange that are different from a scrambling sequence used to scrambleother reference signals associated with frequencies outside of thesecond frequency range. For example, the scrambling sequence used forreference signals within the second frequency range may be different(e.g., use a different range, use different lengths of scrambling codes,etc.).

In some aspects, the scrambling scheme may be a mid-tone scramblingsequence that begins at the center frequency of the second frequencyrange and proceeds outward (e.g., upward and downward) from the centerfrequency through the system bandwidth. Thus, UE 205 may know a prioriwhich scrambling sequence is used on the reference signals used todecode the common control information.

Certain UEs whose bandwidth capability equals or is less than thebandwidth of the first frequency range may be referred to as minimumbandwidth UEs. The described techniques support the UE processing of thecommon control information without knowing the system bandwidth orraster offset, e.g., support handling of these minimum bandwidth UEs.

For UEs with larger bandwidth capabilities, the downlink SIB broadcastmessages may be transmitted over a wider bandwidth, which includes theabove-mentioned minimum bandwidth. This may apply to every beam on whichthe downlink SIB messages are sent, e.g., both in the beam-sweeping caseand in the case of a fixed beam identified via the UE's pre-randomaccess channel (RACH) transmission (discussed with reference to FIGS. 4and 5). The minimum bandwidth UEs may receive just the portions of thedownlink SIB messages that lie within their bandwidth capability.However, the SIB messages may be repeated multiple times. By ensuringthat different subsets of the encoded bits are modulated into theminimum bandwidth subset at different repetitions, this may supportlower bandwidth UEs to also read these downlink SIB messages. Thedescribed techniques may thus support minimum bandwidth UEs by usingdifferent redundancy versions at different repetitions. In aspects,minimum bandwidth UEs may be supported by using the same redundancyversion with a cyclic shift of blocks of tones applied after modulation,e.g., so that a different set of modulation symbols are mapped into theminimum bandwidth at each repetition.

Thus, in some aspects a cyclic shift pattern may be used to convey thecommon control information. For example, a cyclic shift pattern may beselected for block(s) of tones used to convey the common controlinformation. Such an approach may ensure that minimum bandwidth UEsreceive the common control information.

While the above techniques may work for OFDM based systems, concerns mayarise for DFT-s-OFDM based systems due to DFT-spreading across thesystem bandwidth, which makes it difficult for a UE to receiveinformation over a subset of that bandwidth. The described techniquesmay be extended to the case of multi-cluster DFT-s-OFDM transmissions,where each cluster has its own DFT-spreading. In this case the clusterscould define the blocks of tones to be cyclically shifted. Thus, in someaspects a set of clusters for a multi-cluster DFT-s-OFDM scheme may beselected. Each cluster in the multi-cluster DFT-s-OFDM scheme may beassociated with a different DFT spreading function. The set of clustersmay identify the one or more blocks of tones. Thus, in some aspects, thecommon control information may be transmitted according to the cyclicshift pattern and/or according to the set of clusters.

At 240, UE 205 may optionally identify a downlink grant for a SIB. Thedownlink grant may be conveyed or otherwise carried on a PDCCH. Thedownlink grant may provide a pointer to resources allocated fortransmission of a SIB, e.g., resources associated with a PD SCH.

At 245, the network entity 210 may optionally transmit a SIB, e.g., viaa base station, to the UE 205. The SIB may be transmitted via PDSCH, insome aspects. Additionally or alternatively, the SIB may be transmittedvia PDCCH. At 250, the UE 205 may optionally identify a system bandwidthand a raster offset based at least in part on the SIB. For example, theSIB may convey the system bandwidth and raster offset and/or may includea pointer to a table that can be used to identify the system bandwidthand raster offset.

Some wireless communications systems may support multiple SIB types. Forexample, a first SIB type (e.g., which may in some cases be referred toas remaining minimum system information (RMSI)) may convey the minimuminformation (e.g., in addition to system information conveyed via amaster information block (MIB)) which a UE 115 needs before it canparticipate in a RACH procedure. A second SIB type (e.g., other systeminformation (OSI)) may carry complementary information that is notrequired to participate in a RACH procedure. OSI may be carried via SIBor may be conveyed via radio resource control (RRC) signaling. By way ofexample, the RMSI may be carried over the same frequency range as thesynchronization signals (e.g., such that bandwidth-limited UEs 115 maydecode the RMSI and synchronization information). Accordingly, the firstfrequency range (e.g., associated with the synchronization information)may in some cases be the same as the second frequency range, asdescribed further below.

FIG. 3 illustrates an example of a bandwidth diagram 300 for systeminformation block transmission. Diagram 300 may implement one or moreaspects of wireless communications system 100 and/or process flow 200 ofFIGS. 1 and 2. Aspects of diagram 300 may be implemented by a networkentity and/or a UE, which may be examples of the corresponding devicesdescribed above.

Diagram 300 may include an example of a system bandwidth 305 thatincludes a plurality of frequencies 310, which may also be referred toas tones, bins, channels, hops, etc. Although twenty frequencies 310 areillustrated in FIG. 3, it is to be understood that the system bandwidth305 is not limited to twenty frequencies 310 and may, instead, includefewer or more frequencies 310.

Diagram 300 may include a first frequency range 315, a second frequencyrange 320, and a set of frequencies 325. The first frequency range 315may be associated with transmission of synchronization information, asis discussed above. The first frequency range 315 may include a subsetoff frequencies 310 from the system bandwidth 305. Diagram 300 alsoillustrates a raster offset 330 which may be the offset between thecenter frequency of the system bandwidth 305 and the center frequencywithin the first frequency range 315.

The second frequency range 320 may be associated with transmission ofcommon control information. The second frequency range 320 may be basedon the first frequency range 315. In the example of FIG. 3, the secondfrequency range 320 occupies the same subset of frequencies as the firstfrequency range 315. In other examples, the second frequency range maybe a function of the first frequency range 315. For example, the secondfrequency range 320 may be offset above or below the first frequencyrange 315 by a predetermined distance or number of frequencies 310. Inanother example, the second frequency range 320 may be a predetermineddistance above or below the first frequency range 315. Other techniquesmay also be used such that the second frequency range 320 is based on orotherwise a function of the first frequency range 315.

Generally, the set of frequencies 325 (identified as frequencies 325-aand 325-b) generally illustrate the frequencies 310 within the systembandwidth that are outside of the second frequency range 320, e.g., usedfor channelization of downlink and/or uplink transmissions (e.g.,transmissions using PDSCH).

FIG. 4 illustrates an example of a process flow 400 for systeminformation block transmission. Process flow 400 may implement one ormore aspects of wireless communication system 100, a process flow 200,and/or a diagram 300 of FIGS. 1 through 3. Process flow 400 may includea UE 405 and a network entity 410, which may be examples of thecorresponding devices discussed with reference to FIGS. 1 through 3.

Broadly, process flow 400 may implement aspects of the describedtechniques that also include a RACH procedure. For example, even withfixed parameters that avoid the need for scheduling the SIBs, the SIBmessages themselves may still be broadcast. In particular for mmWsystems, broadcasting SIB messages may mean beam-sweeping the broadcastsignals and/or using very low code-rates. Such constraints may beavoided by allowing the UE 405 to go through a RACH procedure afterdecoding as few SIB messages as possible. UE 405 may then receive theremaining system information via unicast signalling (e.g., via RRCsignalling) instead. In particular, the minimum information needed forRACH may be contained in the synchronization information transmissions(e.g., the first frequency range). However, RACH proceduresconventionally use knowledge of the system bandwidth and the rasteroffset in order to distribute the RACH messages over the systembandwidth. To enable UE 405 to perform a RACH procedure without thisknowledge, the bandwidth of the RACH messages may be restricted to berelated to that of first frequency range, similar to the featurediscussed above with respect to the second frequency range.

At 415, the network entity 410 may identify the synchronizationfrequency range of a system bandwidth used for transmission ofsynchronization information. The synchronization frequency range maycorrespond to the first frequency range discussed above.

At 420, the network entity 410 may select the RACH frequency range ofthe system bandwidth that is used for the transmission of the RACHmessages. The RACH frequency range may correspond to a third frequencyrange, in some aspects. The RACH frequency range may be a function ofthe synchronization frequency range, e.g., may be the same as thesynchronization frequency range or may be based on (or a function of)the synchronization frequency range.

At 425, the UE 405 may identify the synchronization frequency range thatis used for transmission of synchronization information. As discussedabove, the synchronization frequency range may correspond to the firstfrequency range discussed above and may be preconfigured. Therefore, UE405 may know the synchronization frequency range a priori.

At 430, the network entity 410 may transmit (and UE 405 may receive) thesynchronization information, e.g., via a base station.

At 435, the UE 405 may identify the RACH frequency range that is usedfor the transmission of RACH messages. The RACH frequency range may bebased on the synchronization frequency range, e.g., may be the samefrequency range, may be a function of the synchronization frequencyrange, and the like. Generally, UE 405 may have preconfiguredinformation associated with the relationship between the synchronizationfrequency range and the RACH frequency range, e.g., information that maybe used to derive the RACH frequency range based at least in part on thesynchronization frequency range.

At 440, UE 405 may transmit a pre-RACH message to the network entity(e.g., via a base station). The pre-RACH message may be transmitted at afrequency within the RACH frequency range. In some aspects, the pre-RACHmessage may include information associated with the location of the UE405 and/or directional information for UE 405 with respect to the basestation.

At 445, network entity 410 (via a base station) may transmit, responsiveto the pre-RACH message, the remaining system information to the UE 405.The remaining system information (e.g., and/or common controlinformation) may be transmitted in a beamforming direction that isindicated in the pre-RACH message.

FIG. 5 illustrates an example of a bandwidth diagram 500 for systeminformation block transmission. Diagram 500 may implement one or moreaspects of wireless communications system 100 and/or process flows 200or 400 of FIGS. 1, 2, and 4. Aspects of diagram 500 may be implementedby a network entity and/or a UE, which may be examples of thecorresponding devices described above.

Diagram 500 may include an example of a system bandwidth 505 thatincludes a plurality of frequencies 510, which may also be referred toas tones, or bins, or channels, etc. Although 20 frequencies 510 areillustrated in FIG. 5, it is to be understood that the system bandwidth505 is not limited to 20 frequencies 510 and may, instead, include feweror more frequencies 510.

Diagram 500 may include a first frequency range 515 (also referred to asa synchronization frequency range) and a second frequency range 520(also referred to as a RACH frequency range). The first frequency range515 may include a subset of frequencies 510 from the set of availablefrequencies that make up the system bandwidth 505. The second frequencyrange 520 may be associated with transmission of RACH messages as a partof a RACH procedure. The second frequency range 520 may be based on thefirst frequency range 515. In the example of FIG. 5, the secondfrequency range 520 occupies more frequencies 510 than the frequenciesof the first frequency range 515. In other examples, the secondfrequency range 520 may be a function of the first frequency range 515.For example, the second frequency range 520 may be offset above or belowthe first frequency range 515 by a predetermined distance or number offrequencies 510. In another example, the second frequency range 520 maybe a predetermined amount of frequencies larger or smaller than thefirst frequency range 515. Other techniques may also be used such thatthe second frequency range 520 is based on or otherwise a function ofthe first frequency range 515.

FIG. 6 shows a block diagram 600 of a wireless device 605 that supportssystem information block transmission in accordance with various aspectsof the present disclosure. Wireless device 605 may be an example ofaspects of a network entity, as described with reference to FIGS. 1through 5. Wireless device 605 may include receiver 610, network entitySIB transmission manager 615, and transmitter 620. Wireless device 605may also include a processor. Each of these components may be incommunication with one another (e.g., via one or more buses).

Receiver 610 may receive information such as packets, user data, orcontrol information associated with various information channels (e.g.,control channels, data channels, and information related to systeminformation block transmission, etc.). Information may be passed on toother components of the device. The receiver 610 may be an example ofaspects of the transceiver 935 described with reference to FIG. 9.

Network entity SIB transmission manager 615 may be an example of aspectsof the network entity SIB transmission manager 915 described withreference to FIG. 9. Network entity SIB transmission manager 615 mayidentify a first frequency range of a system bandwidth used fortransmission of synchronization information, select a second frequencyrange of the system bandwidth used for transmission of common controlinformation, and transmit the common control information within theselected second frequency range of the system bandwidth. In some cases,the second frequency range of the system bandwidth may be a function ofthe first frequency range of the system bandwidth, and the firstfrequency range and the second frequency range may each be less than thesystem bandwidth.

Transmitter 620 may transmit signals generated by other components ofthe device. In some examples, the transmitter 620 may be collocated witha receiver 610 in a transceiver module. For example, the transmitter 620may be an example of aspects of the transceiver 935 described withreference to FIG. 9. The transmitter 620 may include a single antenna,or it may include a set of antennas.

FIG. 7 shows a block diagram 700 of a wireless device 705 that supportssystem information block transmission in accordance with various aspectsof the present disclosure. Wireless device 705 may be an example ofaspects of a wireless device 605 or a network entity, as described withreference to FIGS. 1 through 6. Wireless device 705 may include receiver710, network entity SIB transmission manager 715, and transmitter 720.Wireless device 705 may also include a processor. Each of thesecomponents may be in communication with one another (e.g., via one ormore buses).

Receiver 710 may receive information such as packets, user data, orcontrol information associated with various information channels (e.g.,control channels, data channels, and information related to systeminformation block transmission, etc.). Information may be passed on toother components of the device. The receiver 710 may be an example ofaspects of the transceiver 935 described with reference to FIG. 9.

Network entity SIB transmission manager 715 may be an example of aspectsof the corresponding components described with reference to FIGS. 6, 8,and 9. Network entity SIB transmission manager 715 may also includefirst frequency manager 725, second frequency manager 730, andinformation communication manager 735.

First frequency manager 725 may identify a first frequency range of asystem bandwidth used for transmission of synchronization informationand encode the synchronization information to convey informationassociated with a SIB, where the information is a function of thesynchronization information. In some cases, the synchronizationinformation includes at least one of a PSS, a SSS, a broadcast signal, aPBCH, or combinations thereof.

Second frequency manager 730 may select a second frequency range of thesystem bandwidth used for transmission of common control information,the second frequency range of the system bandwidth being a function ofthe first frequency range of the system bandwidth, and the firstfrequency range and the second frequency range each being less than thesystem bandwidth.

Information communication manager 735 may transmit the common controlinformation and a reference signal within the selected second frequencyrange of the system bandwidth, configure the common control informationto convey an indication of a SIB grant, and transmit the SIB in thecommon control information using a fixed frequency allocation, a knownmodulation order, a known scrambling order, or a combination thereof. Insome cases, the common control information includes a downlink grantreceived on a PDCCH, the downlink grant providing a resource allocationfor a SIB, the SIB indicating the system bandwidth and a raster offset.In some cases, the common control information includes a SIB, the SIBindicating the system bandwidth and a raster offset. Information controlmanager 735 may select a scrambling scheme for the reference signal usedto decode the common control information.

Transmitter 720 may transmit signals generated by other components ofthe device. In some examples, the transmitter 720 may be collocated witha receiver 710 in a transceiver module. For example, the transmitter 720may be an example of aspects of the transceiver 935 described withreference to FIG. 9. The transmitter 720 may include a single antenna,or it may include a set of antennas.

FIG. 8 shows a block diagram 800 of a network entity SIB transmissionmanager 815 that supports system information block transmission inaccordance with various aspects of the present disclosure. The networkentity SIB transmission manager 815 may be an example of aspects of anetwork entity SIB transmission manager 615, a network entity SIBtransmission manager 715, or a network entity SIB transmission manager915 described with reference to FIGS. 6, 7, and 9. The network entitySIB transmission manager 815 may include first frequency manager 820,second frequency manager 825, information communication manager 830,scrambling manager 835, RACH manager 840, cyclic shift manager 845, andcluster manager 850. Each of these modules may communicate, directly orindirectly, with one another (e.g., via one or more buses).

First frequency manager 820 may identify a first frequency range of asystem bandwidth used for transmission of synchronization informationand encode the synchronization information to convey informationassociated with a SIB, where the information is a function of thesynchronization information. In some cases, the synchronizationinformation includes at least one of a PSS, a SSS, a broadcast signal,or combinations thereof.

Second frequency manager 825 may select a second frequency range of thesystem bandwidth used for transmission of common control information,the second frequency range of the system bandwidth being a function ofthe first frequency range of the system bandwidth, and the firstfrequency range and the second frequency range each being less than thesystem bandwidth.

Information communication manager 830 may transmit the common controlinformation and a reference signal within the selected second frequencyrange of the system bandwidth, configure the common control informationto convey an indication of a SIB grant, and transmit the SIB in thecommon control information using a fixed frequency allocation, a knownmodulation order, a known scrambling order, or combinations thereof. Insome cases, the common control information includes a downlink grantreceived on a PDCCH, the downlink grant providing a resource allocationfor a SIB, the SIB indicating the system bandwidth and a raster offset.In some cases, the common control information includes a SIB, the SIBindicating the system bandwidth and a raster offset.

Scrambling manager 835 may select a scrambling scheme for the referencesignal used to decode the common control information, the scramblingscheme being a function of the first frequency range of the systembandwidth, and the common control information including a downlinkgrant. In some cases, the scrambling scheme includes use of a scramblingsequence to scramble the reference signals associated with the secondfrequency range that is different from a system scrambling sequence toscramble other reference signals associated with frequencies outside ofthe second frequency range. In some cases, the scrambling schemeincludes use of a mid-tone scrambling sequence that begins at a centerfrequency of the second frequency range and proceeds outward through thesystem bandwidth.

RACH manager 840 may select a third frequency range of the systembandwidth used for transmissions of one or more messages associated witha RACH procedure, the third frequency range being a function of thefirst frequency range of the system bandwidth, receive a pre-RACHtransmission from a UE at a frequency within the third frequency range,and transmit, responsive to receiving the pre-RACH transmission, thecommon control information to the UE. In some cases, the common controlinformation is transmitted according to a beamforming direction that isindicated by the pre-RACH transmission.

Cyclic shift manager 845 may select a cyclic shift pattern for one ormore blocks of tones conveying the common control information andtransmit the common control information according to the cyclic shiftpattern.

Cluster manager 850 may select a set of clusters for a multi-clusterDFT-s-OFDM scheme, where each cluster in the multi-cluster DFT-s-OFDMscheme is associated with a different DFT spreading function, where theset of clusters identify the one or more blocks of tones and transmitthe common control information according to the set of clusters.

FIG. 9 shows a diagram of a system 900 including a device 905 thatsupports system information block transmission in accordance withvarious aspects of the present disclosure. Device 905 may be an exampleof or include the components of wireless device 605, wireless device705, or a network entity, as described above, e.g., with reference toFIGS. 1 through 7. Device 905 may include components for bi-directionalvoice and data communications including components for transmitting andreceiving communications, including network entity SIB transmissionmanager 915, processor 920, memory 925, software 930, transceiver 935,and I/O controller 940. These components may be in electroniccommunication via one or more buses (e.g., bus 910).

Processor 920 may include an intelligent hardware device, (e.g., ageneral-purpose processor, a digital signal processor (DSP), a centralprocessing unit (CPU), a microcontroller, an application-specificintegrated circuit (ASIC), a field-programmable gate array (FPGA), aprogrammable logic device, a discrete gate or transistor logiccomponent, a discrete hardware component, or any combination thereof).In some cases, processor 920 may be configured to operate a memory arrayusing a memory controller. In other cases, a memory controller may beintegrated into processor 920. Processor 920 may be configured toexecute computer-readable instructions stored in a memory to performvarious functions (e.g., functions or tasks supporting systeminformation block transmission).

Memory 925 may include random access memory (RAM) and read only memory(ROM). The memory 925 may store computer-readable, computer-executablesoftware 930 including instructions that, when executed, cause theprocessor to perform various functions described herein. In some cases,the memory 925 may contain, among other things, a basic input/outputsystem (BIOS) which may control basic hardware and/or software operationsuch as the interaction with peripheral components or devices.

Software 930 may include code to implement aspects of the presentdisclosure, including code to support system information blocktransmission. Software 930 may be stored in a non-transitorycomputer-readable medium such as system memory or other memory. In somecases, the software 930 may not be directly executable by the processorbut may cause a computer (e.g., when compiled and executed) to performfunctions described herein.

Transceiver 935 may communicate bi-directionally, via one or moreantennas, wired, or wireless links as described above (e.g., with one ormore UEs 115). For example, the transceiver 935 may represent a wirelesstransceiver and may communicate bi-directionally with another wirelesstransceiver. The transceiver 935 may also include a modem to modulatethe packets and provide the modulated packets to the antennas fortransmission, and to demodulate packets received from the antennas.

I/O controller 940 may manage input and output signals for device 905.I/O controller 940 may also manage peripherals not integrated intodevice 905. In some cases, I/O controller 940 may represent a physicalconnection or port to an external peripheral. In some cases, I/Ocontroller 940 may utilize an operating system such as iOS®, ANDROID®,MS-DOS®, MS-WINDOWS®, OS/2®, UNIX®, LINUX®, or another known operatingsystem.

FIG. 10 shows a block diagram 1000 of a wireless device 1005 thatsupports system information block transmission in accordance withvarious aspects of the present disclosure. Wireless device 1005 may bean example of aspects of a UE 115 as described with reference to FIGS. 1through 5. Wireless device 1005 may include receiver 1010, UE SIBtransmission manager 1015, and transmitter 1020. Wireless device 1005may also include a processor. Each of these components may be incommunication with one another (e.g., via one or more buses).

Receiver 1010 may receive information such as packets, user data, orcontrol information associated with various information channels (e.g.,control channels, data channels, and information related to systeminformation block transmission, etc.). Information may be passed on toother components of the device. The receiver 1010 may be an example ofaspects of the transceiver 1335 described with reference to FIG. 13.

UE SIB transmission manager 1015 may be an example of aspects of the UESIB transmission manager 1315 described with reference to FIG. 13. UESIB transmission manager 1015 may identify a first frequency range of asystem bandwidth used for transmission of a synchronization information,identify a second frequency range of a system bandwidth used fortransmission of common control information, and receive the commoncontrol information and a reference signal within the identified secondfrequency range of the system bandwidth. In some cases, the secondfrequency range of the system bandwidth is a function of the firstfrequency range of the system bandwidth, and the first frequency rangeand the second frequency range are each less than the system bandwidth.In some cases, the scrambling scheme is a function of the firstfrequency range of the system bandwidth.

Transmitter 1020 may transmit signals generated by other components ofthe device. In some examples, the transmitter 1020 may be collocatedwith a receiver 1010 in a transceiver module. For example, thetransmitter 1020 may be an example of aspects of the transceiver 1335described with reference to FIG. 13. The transmitter 1020 may include asingle antenna, or it may include a set of antennas.

FIG. 11 shows a block diagram 1100 of a wireless device 1105 thatsupports system information block transmission in accordance withvarious aspects of the present disclosure. Wireless device 1105 may bean example of aspects of a wireless device 1005 or a UE 115 as describedwith reference to FIGS. 1 through 5 and 10. Wireless device 1105 mayinclude receiver 1110, UE SIB transmission manager 1115, and transmitter1120. Wireless device 1105 may also include a processor. Each of thesecomponents may be in communication with one another (e.g., via one ormore buses).

Receiver 1110 may receive information such as packets, user data, orcontrol information associated with various information channels (e.g.,control channels, data channels, and information related to systeminformation block transmission, etc.). Information may be passed on toother components of the device. The receiver 1110 may be an example ofaspects of the transceiver 1335 described with reference to FIG. 13.

UE SIB transmission manager 1115 may be an example of aspects of thecorresponding component described with reference to FIGS. 10, 12, and13. UE SIB transmission manager 1115 may also include first frequencymanager 1125, second frequency manager 1130, and informationcommunication manager 1135. First frequency manager 1125 may identify afirst frequency range of a system bandwidth used for transmission of asynchronization information. Second frequency manager 1130 may identifya second frequency range of a system bandwidth used for transmission ofcommon control information, the second frequency range of the systembandwidth being a function of the first frequency range of the systembandwidth, and the first frequency range and the second frequency rangeeach being less than the system bandwidth.

Information communication manager 1135 may receive the common controlinformation and a reference signal within the identified secondfrequency range of the system bandwidth. Information communicationmanager 1135 may descramble the reference signal used to decode thecommon control information according to a scrambling scheme.

Transmitter 1120 may transmit signals generated by other components ofthe device. In some examples, the transmitter 1120 may be collocatedwith a receiver 1110 in a transceiver module. For example, thetransmitter 1120 may be an example of aspects of the transceiver 1335described with reference to FIG. 13. The transmitter 1120 may include asingle antenna, or it may include a set of antennas.

FIG. 12 shows a block diagram 1200 of a UE SIB transmission manager 1215that supports system information block transmission in accordance withvarious aspects of the present disclosure. The UE SIB transmissionmanager 1215 may be an example of aspects of a UE SIB transmissionmanager 1315 described with reference to FIGS. 10, 11, and 13. The UESIB transmission manager 1215 may include first frequency manager 1220,second frequency manager 1225, information communication manager 1230,scrambling manager 1235, RACH manager 1240, and cyclic shift manager1245. Each of these modules may communicate, directly or indirectly,with one another (e.g., via one or more buses).

First frequency manager 1220 may identify a first frequency range of asystem bandwidth used for transmission of a synchronization information.

Second frequency manager 1225 may identify a second frequency range of asystem bandwidth used for transmission of common control information,the second frequency range of the system bandwidth being a function ofthe first frequency range of the system bandwidth, and the firstfrequency range and the second frequency range each being less than thesystem bandwidth.

Information communication manager 1230 may receive the common controlinformation and a reference signal within the identified secondfrequency range of the system bandwidth.

Scrambling manager 1235 may descramble a reference signal used to decodethe common control information according to a scrambling scheme, thescrambling scheme being a function of the first frequency range of thesystem bandwidth, and the common control information including adownlink grant.

RACH manager 1240 may identify a third frequency range of the systembandwidth used for transmission of one or more messages associated witha RACH procedure, the third frequency range being a function of thefirst frequency range of the system bandwidth, transmit a pre-RACHtransmission to a base station at a frequency within the third frequencyrange, and receive, responsive to the transmission of the pre-RACHtransmission, the common control information from the base station. Insome cases, the common control information is received according to abeamforming direction that is indicated by the pre-RACH transmission.

Cyclic shift manager 1245 may receive the common control informationaccording to a cyclic shift pattern, where the cyclic shift patternincludes one or more blocks of tones conveying the common controlinformation.

FIG. 13 shows a diagram of a system 1300 including a device 1305 thatsupports system information block transmission in accordance withvarious aspects of the present disclosure. Device 1305 may be an exampleof or include the components of UE 115 as described above, e.g., withreference to FIGS. 1 through 5. Device 1305 may include components forbi-directional voice and data communications including components fortransmitting and receiving communications, including UE SIB transmissionmanager 1315, processor 1320, memory 1325, software 1330, transceiver1335, antenna 1340, and I/O controller 1345. These components may be inelectronic communication via one or more buses (e.g., bus 1310). Device1305 may communicate wirelessly with one or more base stations 105.

Processor 1320 may include an intelligent hardware device, (e.g., ageneral-purpose processor, a DSP, a CPU, a microcontroller, an ASIC, anFPGA, a programmable logic device, a discrete gate or transistor logiccomponent, a discrete hardware component, or any combination thereof).In some cases, processor 1320 may be configured to operate a memoryarray using a memory controller. In other cases, a memory controller maybe integrated into processor 1320. Processor 1320 may be configured toexecute computer-readable instructions stored in a memory to performvarious functions (e.g., functions or tasks supporting systeminformation block transmission).

Memory 1325 may include RAM and ROM. The memory 1325 may storecomputer-readable, computer-executable software 1330 includinginstructions that, when executed, cause the processor to perform variousfunctions described herein. In some cases, the memory 1325 may contain,among other things, a BIOS which may control basic hardware and/orsoftware operation such as the interaction with peripheral components ordevices.

Software 1330 may include code to implement aspects of the presentdisclosure, including code to support system information blocktransmission. Software 1330 may be stored in a non-transitorycomputer-readable medium such as system memory or other memory. In somecases, the software 1330 may not be directly executable by the processorbut may cause a computer (e.g., when compiled and executed) to performfunctions described herein.

Transceiver 1335 may communicate bi-directionally, via one or moreantennas, wired, or wireless links as described above. For example, thetransceiver 1335 may represent a wireless transceiver and maycommunicate bi-directionally with another wireless transceiver. Thetransceiver 1335 may also include a modem to modulate the packets andprovide the modulated packets to the antennas for transmission, and todemodulate packets received from the antennas.

In some cases, the wireless device may include a single antenna 1340.However, in some cases the device may have more than one antenna 1340,which may be capable of concurrently transmitting or receiving multiplewireless transmissions.

I/O controller 1345 may manage input and output signals for device 1305.I/O controller 1345 may also manage peripherals not integrated intodevice 1305. In some cases, I/O controller 1345 may represent a physicalconnection or port to an external peripheral. In some cases, I/Ocontroller 1345 may utilize an operating system such as iOS®, ANDROID®,MS-DOS®, MS-WINDOWS®, OS/2®, UNIX®, LINUX®, or another known operatingsystem.

FIG. 14 shows a flowchart illustrating a method 1400 for systeminformation block transmission in accordance with various aspects of thepresent disclosure. The operations of method 1400 may be implemented bya network entity or its components as described herein. For example, theoperations of method 1400 may be performed by a network entity SIBtransmission manager as described with reference to FIGS. 6 through 9.In some examples, a network entity may execute a set of codes to controlthe functional elements of the device to perform the functions describedbelow. Additionally or alternatively, the network entity may performaspects the functions described below using special-purpose hardware.

At 1405 the network entity may identify a first frequency range of asystem bandwidth used for transmission of synchronization information.The operations of 1405 may be performed according to the methodsdescribed with reference to FIGS. 1 through 5. In certain examples,aspects of the operations of 1405 may be performed by a first frequencymanager as described with reference to FIGS. 6 through 9.

At 1410 the network entity may select a second frequency range of thesystem bandwidth used for transmission of common control information,the second frequency range of the system bandwidth being a function ofthe first frequency range of the system bandwidth, and the firstfrequency range and the second frequency range each being less than thesystem bandwidth. The operations of 1410 may be performed according tothe methods described with reference to FIGS. 1 through 5. In certainexamples, aspects of the operations of 1410 may be performed by a secondfrequency manager as described with reference to FIGS. 6 through 9.

At 1415 the network entity may select a cyclic shift pattern for one ormore blocks of tones conveying the common control information. Theoperations of 1415 may be performed according to the methods describedwith reference to FIGS. 1 through 5. In certain examples, aspects of theoperations of 1415 may be performed by a cyclic shift manager asdescribed with reference to FIGS. 6 through 9.

At 1420 the network entity may transmit the common control informationat a frequency within the selected second frequency range of the systembandwidth. The operations of 1420 may be performed according to themethods described with reference to FIGS. 1 through 5. In certainexamples, aspects of the operations of 1420 may be performed by aninformation communication manager as described with reference to FIGS. 6through 9.

At 1425 the network entity may transmit the common control informationaccording to the cyclic shift pattern. The operations of 1425 may beperformed according to the methods described with reference to FIGS. 1through 5. In certain examples, aspects of the operations of 1425 may beperformed by a cyclic shift manager as described with reference to FIGS.6 through 9.

FIG. 15 shows a flowchart illustrating a method 1500 for systeminformation block transmission in accordance with various aspects of thepresent disclosure. The operations of method 1500 may be implemented bya network entity or its components as described herein. For example, theoperations of method 1500 may be performed by a network entity SIBtransmission manager as described with reference to FIGS. 6 through 9.In some examples, a network entity may execute a set of codes to controlthe functional elements of the device to perform the functions describedbelow. Additionally or alternatively, the network entity may performaspects the functions described below using special-purpose hardware.

At 1505 the network entity may identify a first frequency range of asystem bandwidth used for transmission of synchronization information.The operations of 1505 may be performed according to the methodsdescribed with reference to FIGS. 1 through 5. In certain examples,aspects of the operations of 1505 may be performed by a first frequencymanager as described with reference to FIGS. 6 through 9.

At 1510 the network entity may select a second frequency range of thesystem bandwidth used for transmission of common control information,the second frequency range of the system bandwidth being a function ofthe first frequency range of the system bandwidth, and the firstfrequency range and the second frequency range each being less than thesystem bandwidth. The operations of 1510 may be performed according tothe methods described with reference to FIGS. 1 through 5. In certainexamples, aspects of the operations of 1510 may be performed by a secondfrequency manager as described with reference to FIGS. 6 through 9.

At 1515 the network entity may select a scrambling scheme for areference signal used to decode the common control information, thescrambling scheme being a function of the first frequency range of thesystem bandwidth, and the common control information comprising adownlink grant. The operations of 1515 may be performed according to themethods described with reference to FIGS. 1 through 5. In certainexamples, aspects of the operations of 1515 may be performed by ascrambling manager as described with reference to FIGS. 6 through 9.

At 1520 the network entity may transmit the common control informationand the reference signal within the selected second frequency range ofthe system bandwidth. The operations of 1520 may be performed accordingto the methods described with reference to FIGS. 1 through 5. In certainexamples, aspects of the operations of 1520 may be performed by aninformation communication manager as described with reference to FIGS. 6through 9.

FIG. 16 shows a flowchart illustrating a method 1600 for systeminformation block transmission in accordance with various aspects of thepresent disclosure. The operations of method 1600 may be implemented bya network entity or its components as described herein. For example, theoperations of method 1600 may be performed by a network entity SIBtransmission manager as described with reference to FIGS. 6 through 9.In some examples, a network entity may execute a set of codes to controlthe functional elements of the device to perform the functions describedbelow. Additionally or alternatively, the network entity may performaspects the functions described below using special-purpose hardware.

At 1605 the network entity may identify a first frequency range of asystem bandwidth used for transmission of synchronization information.The operations of 1605 may be performed according to the methodsdescribed with reference to FIGS. 1 through 5. In certain examples,aspects of the operations of 1605 may be performed by a first frequencymanager as described with reference to FIGS. 6 through 9.

At 1610 the network entity may select a second frequency range of thesystem bandwidth used for transmission of common control information,the second frequency range of the system bandwidth being a function ofthe first frequency range of the system bandwidth, and the firstfrequency range and the second frequency range each being less than thesystem bandwidth. The operations of 1610 may be performed according tothe methods described with reference to FIGS. 1 through 5. In certainexamples, aspects of the operations of 1610 may be performed by a secondfrequency manager as described with reference to FIGS. 6 through 9.

At 1615 the network entity may transmit the common control informationat a frequency within the selected second frequency range of the systembandwidth. The operations of 1615 may be performed according to themethods described with reference to FIGS. 1 through 5. In certainexamples, aspects of the operations of 1615 may be performed by aninformation communication manager as described with reference to FIGS. 6through 9.

At 1620 the network entity may select a third frequency range of thesystem bandwidth used for transmissions of one or more messagesassociated with a random access channel (RACH) procedure, the thirdfrequency range being a function of the first frequency range of thesystem bandwidth. The operations of 1620 may be performed according tothe methods described with reference to FIGS. 1 through 5. In certainexamples, aspects of the operations of 1620 may be performed by a RACHmanager as described with reference to FIGS. 6 through 9.

FIG. 17 shows a flowchart illustrating a method 1700 for systeminformation block transmission in accordance with various aspects of thepresent disclosure. The operations of method 1700 may be implemented bya UE 115 or its components as described herein. For example, theoperations of method 1700 may be performed by a UE SIB transmissionmanager as described with reference to FIGS. 10 through 13. In someexamples, a UE 115 may execute a set of codes to control the functionalelements of the device to perform the functions described below.Additionally or alternatively, the UE 115 may perform aspects thefunctions described below using special-purpose hardware.

At 1705 the UE 115 may identify a first frequency range of a systembandwidth used for transmission of a synchronization information. Theoperations of 1705 may be performed according to the methods describedwith reference to FIGS. 1 through 5. In certain examples, aspects of theoperations of 1705 may be performed by a first frequency manager asdescribed with reference to FIGS. 10 through 13.

At 1710 the UE 115 may identify a second frequency range of a systembandwidth used for transmission of common control information, thesecond frequency range of the system bandwidth being a function of thefirst frequency range of the system bandwidth, and the first frequencyrange and the second frequency range each being less than the systembandwidth. The operations of 1710 may be performed according to themethods described with reference to FIGS. 1 through 5. In certainexamples, aspects of the operations of 1710 may be performed by a secondfrequency manager as described with reference to FIGS. 10 through 13.

At 1715 the UE 115 may receive the common control information and areference signal within the identified second frequency range of thesystem bandwidth. The UE 115 may descramble the reference signal used todecode the common control information according to a scrambling scheme.The operations of 1715 may be performed according to the methodsdescribed with reference to FIGS. 1 through 5. In certain examples,aspects of the operations of 1715 may be performed by an informationcommunication manager as described with reference to FIGS. 10 through13.

It should be noted that the methods described above describe possibleimplementations, and that the operations and the steps may be rearrangedor otherwise modified and that other implementations are possible.Furthermore, aspects from two or more of the methods 1400, 1500, 1600,or 1700 described with reference to FIG. 14, 15, 16, or 17 may becombined.

Techniques described herein may be used for various wirelesscommunications systems such as code division multiple access (CDMA),time division multiple access (TDMA), frequency division multiple access(FDMA), orthogonal frequency division multiple access (OFDMA), singlecarrier FDMA (SC-FDMA), DFT-s-OFDM, and other systems. The terms“system” and “network” are often used interchangeably. A code divisionmultiple access (CDMA) system may implement a radio technology such asCDMA2000, Universal Terrestrial Radio Access (UTRA), etc. CDMA2000covers IS-2000, IS-95, and IS-856 standards. IS-2000 Releases may becommonly referred to as CDMA2000 1×, 1×, etc. IS-856 (TIA-856) iscommonly referred to as CDMA2000 1×EV-DO, High Rate Packet Data (HRPD),etc. UTRA includes Wideband CDMA (WCDMA) and other variants of CDMA. Atime division multiple access (TDMA) system may implement a radiotechnology such as Global System for Mobile Communications (GSM).

An orthogonal frequency division multiple access (OFDMA) system mayimplement a radio technology such as Ultra Mobile Broadband (UMB),Evolved UTRA (E-UTRA), Institute of Electrical and Electronics Engineers(IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDM,etc. UTRA and E-UTRA are part of Universal Mobile Telecommunicationssystem (UMTS). 3GPP LTE and LTE-A are releases of Universal MobileTelecommunications System (UMTS) that use E-UTRA. UTRA, E-UTRA, UMTS,LTE, LTE-A, and GSM are described in documents from the organizationnamed “3rd Generation Partnership Project” (3GPP). CDMA2000 and UMB aredescribed in documents from an organization named “3rd GenerationPartnership Project 2” (3GPP2). The techniques described herein may beused for the systems and radio technologies mentioned above as well asother systems and radio technologies. While aspects an LTE system may bedescribed for purposes of example, and LTE terminology may be used inmuch of the description, the techniques described herein are applicablebeyond LTE applications.

In LTE/LTE-A networks, including such networks described herein, theterm eNB may be generally used to describe the base stations. Thewireless communications system or systems described herein may include aheterogeneous LTE/LTE-A network in which different types of eNBs providecoverage for various geographical regions. For example, each eNB or basestation may provide communication coverage for a macro cell, a smallcell, or other types of cell. The term “cell” may be used to describe abase station, a carrier or component carrier associated with a basestation, or a coverage area (e.g., sector, etc.) of a carrier or basestation, depending on context.

Base stations may include or may be referred to by those skilled in theart as a base transceiver station, a radio base station, an accesspoint, a radio transceiver, a NodeB, eNB, Home NodeB, a Home eNodeB, orsome other suitable terminology. The geographic coverage area for a basestation may be divided into sectors making up only a portion of thecoverage area. The wireless communications system or systems describedherein may include base stations of different types (e.g., macro orsmall cell base stations). The UEs described herein may be able tocommunicate with various types of base stations and network equipmentincluding macro eNBs, small cell eNBs, relay base stations, and thelike. There may be overlapping geographic coverage areas for differenttechnologies.

A macro cell generally covers a relatively large geographic area (e.g.,several kilometers in radius) and may allow unrestricted access by UEswith service subscriptions with the network provider. A small cell is alower-powered base station, as compared with a macro cell, that mayoperate in the same or different (e.g., licensed, unlicensed, etc.)frequency bands as macro cells. Small cells may include pico cells,femto cells, and micro cells according to various examples. A pico cell,for example, may cover a small geographic area and may allowunrestricted access by UEs with service subscriptions with the networkprovider. A femto cell may also cover a small geographic area (e.g., ahome) and may provide restricted access by UEs having an associationwith the femto cell (e.g., UEs in a closed subscriber group (CSG), UEsfor users in the home, and the like). An eNB for a macro cell may bereferred to as a macro eNB. An eNB for a small cell may be referred toas a small cell eNB, a pico eNB, a femto eNB, or a home eNB. An eNB maysupport one or multiple (e.g., two, three, four, and the like) cells(e.g., component carriers). A UE may be able to communicate with varioustypes of base stations and network equipment including macro eNBs, smallcell eNBs, relay base stations, and the like.

The wireless communications system or systems described herein maysupport synchronous or asynchronous operation. For synchronousoperation, the base stations may have similar frame timing, andtransmissions from different base stations may be approximately alignedin time. For asynchronous operation, the base stations may havedifferent frame timing, and transmissions from different base stationsmay not be aligned in time. The techniques described herein may be usedfor either synchronous or asynchronous operations.

The downlink transmissions described herein may also be called forwardlink transmissions while the uplink transmissions may also be calledreverse link transmissions. Each communication link describedherein—including, for example, wireless communications system 100 ofFIG. 1—may include one or more carriers, where each carrier may be asignal made up of multiple sub-carriers (e.g., waveform signals ofdifferent frequencies).

The description set forth herein, in connection with the appendeddrawings, describes example configurations and does not represent allthe examples that may be implemented or that are within the scope of theclaims. The term “exemplary” used herein means “serving as an example,instance, or illustration,” and not “preferred” or “advantageous overother examples.” The detailed description includes specific details forthe purpose of providing an understanding of the described techniques.These techniques, however, may be practiced without these specificdetails. In some instances, well-known structures and devices are shownin block diagram form in order to avoid obscuring the concepts of thedescribed examples.

In the appended figures, similar components or features may have thesame reference label. Further, various components of the same type maybe distinguished by following the reference label by a dash and a secondlabel that distinguishes among the similar components. If just the firstreference label is used in the specification, the description isapplicable to any one of the similar components having the same firstreference label irrespective of the second reference label.

Information and signals described herein may be represented using any ofa variety of different technologies and techniques. For example, data,instructions, commands, information, signals, bits, symbols, and chipsthat may be referenced throughout the above description may berepresented by voltages, currents, electromagnetic waves, magneticfields or particles, optical fields or particles, or any combinationthereof.

The various illustrative blocks and modules described in connection withthe disclosure herein may be implemented or performed with ageneral-purpose processor, a DSP, an ASIC, an FPGA or other programmablelogic device, discrete gate or transistor logic, discrete hardwarecomponents, or any combination thereof designed to perform the functionsdescribed herein. A general-purpose processor may be a microprocessor,but in the alternative, the processor may be any conventional processor,controller, microcontroller, or state machine. A processor may also beimplemented as a combination of computing devices (e.g., a combinationof a DSP and a microprocessor, multiple microprocessors, one or moremicroprocessors in conjunction with a DSP core, or any other suchconfiguration).

The functions described herein may be implemented in hardware, softwareexecuted by a processor, firmware, or any combination thereof. Ifimplemented in software executed by a processor, the functions may bestored on or transmitted over as one or more instructions or code on acomputer-readable medium. Other examples and implementations are withinthe scope and spirit of the disclosure and appended claims. For example,due to the nature of software, functions described above can beimplemented using software executed by a processor, hardware, firmware,hardwiring, or combinations of any of these. Features implementingfunctions may be physically located at various positions, includingbeing distributed such that portions of functions are implemented atdifferent physical locations. As used herein, including in the claims,the term “and/or,” when used in a list of two or more items, means thatany one of the listed items can be employed by itself, or anycombination of two or more of the listed items can be employed. Forexample, if a composition is described as containing components A, B,and/or C, the composition can contain A alone; B alone; C alone; A and Bin combination; A and C in combination; B and C in combination; or A, B,and C in combination. Also, as used herein, including in the claims,“or” as used in a list of items (for example, a list of items prefacedby a phrase such as “at least one of” or “one or more of”) indicates aninclusive list such that, for example, a phrase referring to “at leastone of” a list of items refers to any combination of those items,including single members. As an example, “at least one of: A, B, or C”is intended to cover A, B, C, A-B, A-C, B-C, and A-B-C, as well as anycombination with multiples of the same element (e.g., A-A, A-A-A, A-A-B,A-A-C, A-B-B, A-C-C, B-B, B-B-B, B-B-C, C-C, and C-C-C or any otherordering of A, B, and C). Also, as used herein, the phrase “based on”shall not be construed as a reference to a closed set of conditions. Forexample, an exemplary step that is described as “based on condition A”may be based on both a condition A and a condition B without departingfrom the scope of the present disclosure. In other words, as usedherein, the phrase “based on” shall be construed in the same manner asthe phrase “based at least in part on.”

Computer-readable media includes both non-transitory computer storagemedia and communication media including any medium that facilitatestransfer of a computer program from one place to another. Anon-transitory storage medium may be any available medium that can beaccessed by a general purpose or special purpose computer. By way ofexample, and not limitation, non-transitory computer-readable media maycomprise RAM, ROM, electrically erasable programmable read only memory(EEPROM), compact disk (CD) ROM or other optical disk storage, magneticdisk storage or other magnetic storage devices, or any othernon-transitory medium that can be used to carry or store desired programcode means in the form of instructions or data structures and that canbe accessed by a general-purpose or special-purpose computer, or ageneral-purpose or special-purpose processor. Also, any connection isproperly termed a computer-readable medium. For example, if the softwareis transmitted from a website, server, or other remote source using acoaxial cable, fiber optic cable, twisted pair, digital subscriber line(DSL), or wireless technologies such as infrared, radio, and microwave,then the coaxial cable, fiber optic cable, twisted pair, digitalsubscriber line (DSL), or wireless technologies such as infrared, radio,and microwave are included in the definition of medium. Disk and disc,as used herein, include CD, laser disc, optical disc, digital versatiledisc (DVD), floppy disk and Blu-ray disc where disks usually reproducedata magnetically, while discs reproduce data optically with lasers.Combinations of the above are also included within the scope ofcomputer-readable media.

The description herein is provided to enable a person skilled in the artto make or use the disclosure. Various modifications to the disclosurewill be readily apparent to those skilled in the art, and the genericprinciples defined herein may be applied to other variations withoutdeparting from the scope of the disclosure. Thus, the disclosure is notlimited to the examples and designs described herein, but is to beaccorded the broadest scope consistent with the principles and novelfeatures disclosed herein.

What is claimed is:
 1. A method for wireless communication, comprising:receiving synchronization information from a base station over a firstfrequency range; identifying an offset of a second frequency rangerelative to the first frequency range based at least in part on thesynchronization information; receiving control information from the basestation within the second frequency range; and receiving a referencesignal used to decode the control information within the secondfrequency range, wherein a scrambling scheme for the reference signal isbased at least in part on the second frequency range.
 2. The method ofclaim 1, wherein the control information comprises a downlink grantindicating a third frequency range, the method further comprising:receiving system information from the base station over the thirdfrequency range.
 3. The method of claim 2, wherein the second frequencyrange and the third frequency range are a same frequency range.
 4. Themethod of claim 1, wherein the scrambling scheme that is a function ofthe second frequency range is different from a system scrambling schemeused to scramble other reference signals associated with other downlinkgrants.
 5. The method of claim 1, wherein the control informationcomprises a system information block (SIB) transmitted on a physicaldownlink shared channel (PDSCH).
 6. The method of claim 5, wherein theSIB comprises system bandwidth information.
 7. The method of claim 6,further comprising: identifying a third frequency range used fortransmission of one or more messages associated with a random accesschannel (RACH) procedure based at least in part on the system bandwidthinformation.
 8. The method of claim 1, wherein the synchronizationinformation comprises at least one of a primary synchronization signal(PSS), a secondary synchronization signal (SSS), a broadcast signal, ora physical broadcast channel (PBCH).
 9. The method of claim 1, whereinthe offset of the second frequency range relative to the first frequencyrange is zero.
 10. The method of claim 1, wherein the second frequencyrange is larger than the first frequency range.
 11. A method forwireless communication, comprising: transmitting synchronizationinformation over a first frequency range; selecting an offset of asecond frequency range relative to the first frequency range;transmitting control information within the second frequency range;scrambling a reference signal associated with the control informationaccording to a scrambling scheme that is a function of the secondfrequency range; and transmitting the reference signal within the secondfrequency range.
 12. The method of claim 11, wherein the controlinformation comprises a downlink grant indicating a third frequencyrange, the method further comprising: transmitting system informationover the third frequency range.
 13. The method of claim 12, wherein thesecond frequency range and the third frequency range are a samefrequency range.
 14. The method of claim 11, wherein the scramblingscheme that is a function of the second frequency range is differentfrom a system scrambling scheme used to scramble other reference signalsassociated with other downlink grants.
 15. The method of claim 11,wherein the control information a system information block (SIB)transmitted on a physical downlink shared channel (PDSCH).
 16. Themethod of claim 15, wherein the SIB comprises system bandwidthinformation.
 17. The method of claim 11, wherein the synchronizationinformation comprises at least one of a primary synchronization signal(PSS), a secondary synchronization signal (SSS), a broadcast signal, ora physical broadcast channel (PBCH).
 18. The method of claim 11, whereinthe offset of the second frequency range relative to the first frequencyrange is zero.
 19. The method of claim 11, wherein the second frequencyrange is larger than the first frequency range.
 20. An apparatus forwireless communication, in a system comprising: a processor; memory inelectronic communication with the processor; and instructions stored inthe memory and operable, when executed by the processor, to cause theapparatus to: receive synchronization information from a base stationover a first frequency range; identify an offset of a second frequencyrange relative to the first frequency range based at least in part onthe synchronization information; receive control information from thebase station within the second frequency range; and receive a referencesignal used to decode the control information within the secondfrequency range, wherein a scrambling scheme for the reference signal isbased at least in part on the second frequency range.
 21. The apparatusof claim 20, wherein the control information comprises a downlink grantindicating a third frequency range, the instructions further executableby the processor to cause the apparatus to: receive system informationfrom the base station over the third frequency range.
 22. The apparatusof claim 21, wherein the second frequency range and the third frequencyrange are a same frequency range.
 23. The apparatus of claim 20, whereinthe scrambling scheme that is a function of the second frequency rangeis different from a system scrambling scheme used to scramble otherreference signals associated with other downlink grants.
 24. Theapparatus of claim 20, wherein the control information comprises asystem information block (SIB) transmitted on a physical downlink sharedchannel (PDSCH).
 25. The apparatus of claim 24, wherein the SIBcomprises system bandwidth information.
 26. The apparatus of claim 25,wherein the instructions are further executable by the processor tocause the apparatus to: identify a third frequency range used fortransmission of one or more messages associated with a random accesschannel (RACH) procedure based at least in part on the system bandwidthinformation.
 27. The apparatus of claim 20, wherein the synchronizationinformation comprises at least one of a primary synchronization signal(PSS), a secondary synchronization signal (SSS), a broadcast signal, ora physical broadcast channel (PBCH).
 28. The apparatus of claim 20,wherein the offset of the second frequency range relative to the firstfrequency range is zero.
 29. The apparatus of claim 20, wherein thesecond frequency range is larger than the first frequency range.
 30. Anapparatus for wireless communication, in a system comprising: aprocessor; memory in electronic communication with the processor; andinstructions stored in the memory and operable, when executed by theprocessor, to cause the apparatus to: transmit synchronizationinformation over a first frequency range; select an offset of a secondfrequency range relative to the first frequency range; transmit controlinformation within the second frequency range; scramble a referencesignal associated with the control information according to a scramblingscheme that is a function of the second frequency range; and transmitthe reference signal within the second frequency range.
 31. Theapparatus of claim 30, wherein the control information comprises adownlink grant indicating a third frequency range, the instructionsfurther executable by the processor to cause the apparatus to: transmitsystem information over the third frequency range.
 32. The apparatus ofclaim 31, wherein the second frequency range and the third frequencyrange are a same frequency range.
 33. The apparatus of claim 30, whereinthe scrambling scheme that is a function of the second frequency rangeis different from a system scrambling scheme used to scramble otherreference signals associated with other downlink grants.
 34. Theapparatus of claim 30, wherein the control information comprises asystem information block (SIB) transmitted on a physical downlink sharedchannel (PDSCH).
 35. The apparatus of claim 34, wherein the SIBcomprises system bandwidth information.
 36. The apparatus of claim 30,wherein the synchronization information comprises at least one of aprimary synchronization signal (PSS), a secondary synchronization signal(SSS), a broadcast signal, or a physical broadcast channel (PBCH). 37.The apparatus of claim 30, wherein the offset of the second frequencyrange relative to the first frequency range is zero.
 38. The apparatusof claim 30, wherein the second frequency range is larger than the firstfrequency range.